Evaporator



2 Sheets-Sheet 1.

E. P. MILES. Evaporator. No. 232,200. I Patented Sept.,14,1 880.

ATTORNEYS.

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Evaporator. No. 232,200. Patented Sept. 14, 1880.

2 Sheets-Sheet 2.

WITNESSES IN VBN FITORE I 1 I BY 2 g 2 2 TTORNEYS.

UNITED STATES PATENT OFFICE,

ENOS P. MILES, OF CLAY CENTRE, KANSAS.

EVA PO RATO R.

SPECIFICATION forming part of Letters Patent No. 232,200, dated September 14, 1880- Application filed November 7, 1879.

To all whom it may concern:

Be it known that I, Enos 1?. MILES, of Clay Centre, in the county of Clay and State of Kansas, have invented a new and useful Improvement in Evaporators, of which the following is a specification.

This invention relates to improvements in the arrangement and operation of the evaporating-pans and the furnace-fines and dampers for regulating the direction and quantity of heat passing under them, the object whereof is to supply to the pans a gradually-decreasin g heat suitable to the successive stages in converting the juice to sirup.

My invention consists of a furnace in the form of a segment of a circle, having flues divided into a number of compartments, communicatin g with each other and with the stack through dampers, as hereinafter described.

In the accompanying drawings, Figure 1 is a top plan of the furnace with the pans removed. Fig. 2 is a top plan with the evaporating-pans in place, and Fig. 3 is a sectional view of the pans and furnace, taken on line a .00.

Similar letters of reference indicate corresponding parts. I

Referring to the drawings, A is the firechamber of the furnace, from the upper part whereof extends the flue-plate B, in the form of a segment of a circle, (an angular segment bein g cut out opposite the stack and adjoining the fire-chamber.) The flue-plate is surmounted by a crown, O. The flue 0, leading directly from the fire-chamber to the stack D, is divided from flue C by a projection, a, from under the breast of the chimney. A damper, I), held in a slot in projection to, and having a handle, 0, projecting out through the back of the chimney, serves to close the space between the endof the projection and the part of the crown opposite.

From the end of the projection a a deflector, (1, projects out at an obtuse angleinto flue G. The purpose of this deflector is to compel the products of combustion to circulate under the evaporating-pan placed over the flue.

Dampers c 0 project through opposite sides of the chimney against the part of the projection a held under the base of the chimney. When damper c is open the products of combustion pass from the fine 0' directly into the stack, as indicated by arrow 1; but when damper e is closed and dampers b and 0' opened the products pass from flue G to G, thence to the stack, as indicated by arrows 2.

A spider-frame composed of three arms, f ff, radiating from a center, 9, is connected with the furnace by a pix'ot, h, passed down through the center 9 and socketed in the angular junction of the crown at z'. This frame rotates on the pivot, and is steadied by lips j, projecting from its ends and resting on the edge of the crown.

F F F are the evaporating-pans. These are triangular, having two straight sides, and one (the outer) curved to form the segment of a circle concentric with the center of the furnace. These pans are placed on the spider with their straight edges resting on the arms and their sides against the ribs it, placed in the middle of the arms lengthwise. On the ends of the arms are angular lugs Zon each edge, rounded on top. These lugs rest in sockets in the pans, and serve as pivots on which the pans can be swung over and tilted to empty them of their contents.

On the upper end of pivot h is pivoted an arm, m, from the short end whereof depends a catch, a, the right-angular extension whereof is designed to rest on the edge of the pan at the junction of the two straight, sides when any one of the pans is turned from over the flue G to the open space between this part of the furnace and the fire-chamber, in the manner indicated by the sectional view of the pan in Fig. 3. The purpose of this is to prevent the pan so situated from turning or tilting.

The other pans, when over the furnace, have the circular edge resting on the edge of the crown, a close junction being formed therewith, and with the arms of the spider, by makin g a rabbet, 0, to receive them all around the edge of the bottom.

The operation of this invention is as follows: The pans being placed on the spider-frame, as shown in Fig. 2, and a fire built in the furnace, the pan No. 1 over the open space next to the furnace is filled with the green juice, and when the fire is in the proper condition the frameis rotated, so as to carry pan No. 2, which has been over the fire-chamber, to flue G, which brings pan No. 1 over the fire and flue G.

Damper b is closed, thus cutting off communication with flue G, and damper c is opened. Pan No. 3, which is over the open space, is now filled with green juice, and when that in pan No. 1 has come to a hard boil and is properly skimmed, dampers I) c are opened, damper 0 closed, and the pans rotated with the f "ame, so as to carry No. 1 ever flue O, No. 2 over the open space, and No. 3 over the fire. No. 2 is now filled with green juice, and when that in No. 3 is at the proper stage and that in No. 1 has been completed the pans are again rotated, carrying No. 2 over the fire, No. 3 to the second stage over flue 0", and No. 1 over the open space, where the sirup is allowed to cool, and is then removed from the pan, which is cleaned and again filled with juice, ready to make the circuit again. In this way a continuous succession of pans containing the mate rial in all stages, from the green juice just placed over the fire to the completed and cooling sirup, can be kept going. No cooling takes place until the sirup is completed, as from the time the pan is turned over the fire until it is completed it is kept exposed to the heat.

A leg, G, extends from the furnace out into the open space. The purpose of this is to limit the movement of the pan when tilted.

I do not limit myself to the use of three pans and two flues. These may be increased indefinitely, according to the size of the furnace.

1 am aware that it is not new to support pans upon cranes adapted to revolve, so as to bring them over the furnace, or to use a series of pans on wheels, so as to expose them to heat during their revolution; but

hat I claim as new is- 1. The furnace composed of fire-ehamberA, fines O C, separated by projection a, and damper I), each flue communicating with the stack, in combination with the rotary spideri'rame and evaporating-pans F 1* F, placed on the said frame, whereby the pans may be rotated with the latter and their contents eX- posed to the heat in the fines successively until the sirup in one pan is completed, when this pan is rotated over the open space between the fire-chamber and line C for the purpose of cooling the sirup and removing it from the pan without disturbing the contents of the other pans, substantially as described.

2. The arm m, provided with the latch a, hanging from the arm m, pivoted on It, in combination with the pans,for the purpose ofholding them up when removed from the support offered by the crown when turned into the open space for the purpose oteoolin g the sirup, substantially as described.

ENOS P. MILES.

Witnesses:

JEREMIAH MiLEs, L. M. 'WlcksrrnoM. 

